Ultra-High Surface Area Single-Walled Carbon Nanotubes

Ultra-High Surface Area Single-Walled Carbon Nanotubes

Ultra-high purity large specific surface area single-walled carbon nanotubes are a novel high-end one-dimensional nanomaterial that has undergone multi-stage fine purification and structural optimization. They are formed by seamlessly rolling a single layer of graphene along a specific direction to create a seamless hollow tubular structure. Hailed as the “super material of the 21st century,” they combine the intrinsic superior properties of single-walled carbon nanotubes with the unique advantages of ultra-high purity and large specific surface area, making them a core supporting material in cutting-edge fields such as semiconductors and high-end lithium batteries. It appears as a black powder or dispersed liquid, with a purity exceeding 99.9%, and some high-end products achieving purity exceeding 99.99%. The metal impurity content is ≤0.5ppm. The diameter is typically 0.4-2nm, the length 5-30μm, and the specific surface area is as high as 1300-1500m²/g. Its conductivity is 100 times higher than copper, and its thermal conductivity exceeds 3000 W/m・K. It can be prepared through chemical vapor deposition combined with gel chromatography and density gradient ultracentrifugation purification processes. Compared to ordinary single-walled carbon nanotubes, it has extremely low impurity content, fewer structural defects, and more stable electrical and thermal conductivity and mechanical properties. Its large specific surface area makes it easier to leverage adsorption and loading advantages, making it suitable for the precision fabrication needs of high-end devices.

Although ultra-high purity, large specific surface area single-walled carbon nanotubes exhibit superior performance, their ultra-high purity, high aspect ratio, high surface energy due to the large specific surface area, and limitations imposed by the inter-tube forces make it difficult to achieve high-quality film formation using traditional spraying processes. With its extremely high surface energy, the tubes are prone to agglomeration and entanglement due to strong van der Waals forces, forming dense aggregates. This not only fails to leverage the core advantage of its large specific surface area but also leads to defects such as porosity and uneven thickness in the coating, making it impossible to establish a continuous conductive network. Furthermore, the tubes are thin and fragile; the high-pressure impact and mechanical shearing forces of traditional air-pressure spraying and spin coating processes easily cause tube breakage, damaging its one-dimensional nanostructure and introducing impurities, compromising its ultra-high purity properties and resulting in a significant decrease in electrical and thermal conductivity. In addition, traditional processes suffer from uneven atomization, significant material loss, and substantial waste of expensive ultra-high purity, large specific surface area single-walled carbon nanotubes. Poor coating thickness consistency fails to meet the stringent coating standards of semiconductor chip manufacturing processes below 3nm and high-end energy storage, severely limiting its industrialization and large-scale application.

Chifei ultrasonic spraying machines, specifically designed for the material characteristics of ultra-high purity, large specific surface area single-walled carbon nanotubes, offer a customized precision spraying process, completely resolving the various pain points of traditional processes. The equipment employs a 25kHz-180kHz high-frequency ultrasonic atomization principle. Through a piezoelectric transducer, electrical energy is converted into high-frequency mechanical vibration, uniformly atomizing an ultra-high purity, large specific surface area single-walled carbon nanotube dispersion into micron-sized droplets. The entire process involves low-pressure, gentle atomization, without high-pressure impact or mechanical shearing, maximizing the protection of the carbon nanotube’s intact structure and preventing breakage. It also eliminates the introduction of impurities that could damage its ultra-high purity, precisely preserving the adsorption and loading advantages brought by its large specific surface area and fully releasing its core performance. Simultaneously, high-frequency atomization effectively breaks up agglomerated and entangled nanotubes, ensuring uniform distribution of carbon nanotubes in the sprayed droplets and fundamentally solving problems such as coating porosity and uneven thickness.

Compared to traditional spraying processes, Chifei ultrasonic spraying equipment offers significant advantages. The equipment boasts high atomization uniformity, with coating thickness uniformity consistently within a 5% deviation. It enables the fabrication of nanoscale ultrathin continuous films, producing dense, pinhole-free, and crack-free coatings that effectively retain the high electrical and thermal conductivity, as well as the large specific surface area, of ultra-high purity, large-specific-surface-area single-walled carbon nanotubes, meeting the performance requirements of high-end devices. The non-contact directional deposition spraying method allows for carbon nanotube utilization rates exceeding 90%, a significant improvement over traditional processes, greatly reducing production costs and aligning with green production principles. The equipment exhibits strong compatibility, adapting to dispersions in various solvent systems and various substrates such as silicon wafers, metals, flexible films, and medical polymer materials. It can achieve both large-area uniform spraying and small-area precision spraying, meeting the needs of both laboratory research and industrial mass production.

In practical applications, ultra-high purity, large-specific-surface-area single-walled carbon nanotube films prepared by the Chifei ultrasonic spraying machine exhibit stable performance and good repeatability, making them widely applicable across multiple fields. In the semiconductor field, it can be used as a coating for chip manufacturing processes below 3nm, replacing traditional copper wires and improving thermal conductivity by 41%, helping to solve computing power bottlenecks. In the lithium battery field, adding a small amount can form a long-range conductive network, significantly improving battery energy density and cycle life, meeting the needs of high-end power batteries and energy storage batteries, especially suitable for silicon-based anode systems, alleviating volume expansion problems. In the flexible electronics field, it can be used as a conductive coating for flexible displays and wearable devices, relying on its excellent flexibility and conductivity to adapt to folding and bending scenarios. In the biomedical field, thanks to its good biocompatibility and ultra-large specific surface area, it can be used for brain-computer interfaces, biosensors, drug carriers, etc., to achieve precise detection and sustained drug release.

Today, with the continuous iteration of semiconductor, lithium battery, and flexible electronics technologies, the market application of ultra-high purity, large specific surface area single-walled carbon nanotubes is becoming increasingly widespread, and the requirements for the precision and stability of spraying processes are constantly increasing. Chifei Ultrasonic Equipment Co., Ltd. has been deeply involved in the field of nano-coating for many years, focusing on solving the precision film formation problems of various high-end nanomaterials. Relying on mature equipment technology and a complete process system, it provides efficient, stable and cost-effective complete solutions for the preparation of ultra-high purity large specific surface area single-walled carbon nanotube films, helping various high-end manufacturing enterprises to achieve technological upgrades and mass production.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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